2551791 has 16 divisors (see below), whose sum is σ = 3784320. Its totient is φ = 1516320.

The previous prime is 2551733. The next prime is 2551793. The reversal of 2551791 is 1971552.

It is not a de Polignac number, because 2551791 - 2⁹ = 2551279 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020 + ... + 2478.

It is an arithmetic number, because the mean of its divisors is an integer number (236520).

2^2551791 is an apocalyptic number.

2551791 is a deficient number, since it is larger than the sum of its proper divisors (1232529).

2551791 is a wasteful number, since it uses less digits than its factorization.

2551791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526.

The product of its digits is 3150, while the sum is 30.

The square root of 2551791 is about 1597.4326276873. The cubic root of 2551791 is about 136.6516984069.

The spelling of 2551791 in words is "two million, five hundred fifty-one thousand, seven hundred ninety-one".